The Expert Five tips for hassle-free flying Tripadvisor's Emma O'Boyles guide to stress free aviation...1 Check-in online – lots of airlines offer mobile check-in. Then, if you've only got hand luggage, you can avoid the check-in desks all together. 2 Sit near the wing, you'll feel turbulence less there. 3 Stay well hydrated. As tempting as it may be to drink alcohol, too much will seriously dehydrate you. 4 Complete your landing card onboard and be sure to register for the iris recognition immigration system (IRIS); these queues are usually much shorter. 5 Book a taxi from the airport in advance. You'll get better rates and save precious time…